Abstract

We propose and demonstrate a two-color formaldehyde planar laser induced fluorescence spectroscopy thermometry scheme using the third-harmonic of injection-seeded Nd:YAG lasers. The $28183.5\; {{\rm{cm}}^{- 1}}$ and $28184.5 \;{{\rm cm}^{- 1}}$ peaks of formaldehyde are identified to measure the low-temperature combustion zone. Using a fast dual-wavelength-switching burst mode amplifier and a high-speed camera, high-repetition-rate (20 kHz) temperature field measurement is validated on a laminar coflow diffusion flame and demonstrated on a turbulent reacting jet in hot crossflow. Directly using the 355 nm output has the advantage of large energy and high signal-to-noise ratio. Combined with the fast dual-wavelength-switching method, the proposed scheme can greatly reduce experimental complexity and improve the understanding of practical combustors.

© 2021 Optical Society of America

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